PoppinJ
Well-Known Member
- Thread starter
- #1
Just putting the results of my efforts here. First off, if you're serious about tracking the car then get a cooler. Period. Full tilt boogie makes a kit plenty of people are happy with for 1k, or you can grab the ford performance one for 2200ish, and not have all the fancy rear bumper areo like the GT350 has.
.
Anywho, all Ive wanted is to try and get about 25 min out of the car on the track before the temp warning hits. For the 2018 models this triggers at 270 and goes into limp mode at 300. With my strategy your diff fluid will get close to or at 270 each session so still way to hot to be healthy. I think the GT 350 stays around 160 with the cooler, and FTB recommends setting the thermostat to 165. So if your temps are reliably getting up to 270 plan on changing the diff fluid more often.
So most recommendations start with wrapping the exhaust as it goes around the rear diff to stop heat soak, as well as changing to a higher viscosity fluid. Stock is 75w90, Im currently running 75w140 Redline full synthetic. (1.6L is whats required). Switching to a thicker weight oil really doesn't change how quickly the diff cools or heats up, but it will provide some additional protection during track time where the diff is close to 270, or even standard sustained highway driving where it is around 190ish.
Wrapping the exhaust is helpful but ultimately wont do the trick if you're pushing the car really hard. Part of the problem is the physical location of the diff. Its tucked waaayyy up there where it gets relatively little airflow, and what it does get is already superheated. While driving it is getting air that has already blown across the engine, transmission cooling fins, and the length of the exhaust.
An additional tidbit that will help during track days is to run with traction control off, or at least in Sport+ mode. Traction control will use the rear brakes to stop the wheels from spinning so it will continuously place additional friction on the diff gears. Im not saying to turn if off if you need it, just be aware that if it is coming on a lot then it is likely adding addition heating load to the diff( plus you're cooking your rear pads and rotors).
(most of this data is coming from my last track day. Pretty much perfect scenario keep that in mind. Low of 44, high of 60)
During my track days I wouldn't really overheat on my first run or two, but the later sessions would overheat pretty quickly. So I started paying attention to the starting temps. During my later runs I would check in the staging area and the temp was still at 180+, even after sitting in the paddock area for over an hour. With starting temps this high I would trigger the warning after about 15 min or so :( and had to call it quits. Even a slow lap to try to cool it off didnt really help at all (again, terrible airflow). So I decided to try and reduce starting temps.I found a ryobi fan at home depot for like 40 bucks and already have plenty of power packs so I picked it up to take to the track. Between my sessions I would place it under the car blowing directly on the diff.I think it would be most effective to put a fan on the front side of the diff where the driveshaft enters blowing back but the fan did not fit under there.
I drive about an hour or so to the track and my first run usually has time to cool down to under 100 degrees by my first session. No temp warning. Off the track at 250 degrees. Put the fan on it and see immediate huge reduction in temps. It went from 240 to 140 in about 15 min. HUGE! After having the fan blow on it for the entire time between sessions, around and hour and a half, I have temps at around 113. The fan is blowing on the back cover where the sensor is so as soon as I pull the fan off and drive to stage the temp is up to about 125. It holds there until start. Didn't get any temp warnings off of my 30 min session. I do this between each session with similar results. It never really has time to get below 120 by the time I drive onto the track. Kinda a bummer with ambient temps around 55, but much better than starting at 190. I didnt get a warning on sessions 1-4, and finally got the temp warning 27 min into my 5th and final session. By this time the ambient temps were around 60.
Im sure as the season goes on and temps get warmer this might not be as effective, but Im pretty stoked the combination of all this has pretty much gotten me to my goal of 25 min overheat free. Ill post back as the summer months come on to see how it goes, but Im likely to continue improving with my driver mod too, so the combo of higher ambient temps and pushing the car harder might make all this less effective and I'll still end up needing a cooler. We shall see. Hope this helps somebody.
Cheers
More info Here:
https://www.mustang6g.com/forums/threads/ftb-diff-cooler-installed.114217/
https://www.mustang6g.com/forums/threads/2018-gt-pp2-rear-differential-overheating-issue.106844/
Kinda Here
https://www.mustang6g.com/forums/th...-for-the-mustang-āsuper-8-8ā-rear-end.117720/
.
Anywho, all Ive wanted is to try and get about 25 min out of the car on the track before the temp warning hits. For the 2018 models this triggers at 270 and goes into limp mode at 300. With my strategy your diff fluid will get close to or at 270 each session so still way to hot to be healthy. I think the GT 350 stays around 160 with the cooler, and FTB recommends setting the thermostat to 165. So if your temps are reliably getting up to 270 plan on changing the diff fluid more often.
So most recommendations start with wrapping the exhaust as it goes around the rear diff to stop heat soak, as well as changing to a higher viscosity fluid. Stock is 75w90, Im currently running 75w140 Redline full synthetic. (1.6L is whats required). Switching to a thicker weight oil really doesn't change how quickly the diff cools or heats up, but it will provide some additional protection during track time where the diff is close to 270, or even standard sustained highway driving where it is around 190ish.
Wrapping the exhaust is helpful but ultimately wont do the trick if you're pushing the car really hard. Part of the problem is the physical location of the diff. Its tucked waaayyy up there where it gets relatively little airflow, and what it does get is already superheated. While driving it is getting air that has already blown across the engine, transmission cooling fins, and the length of the exhaust.
An additional tidbit that will help during track days is to run with traction control off, or at least in Sport+ mode. Traction control will use the rear brakes to stop the wheels from spinning so it will continuously place additional friction on the diff gears. Im not saying to turn if off if you need it, just be aware that if it is coming on a lot then it is likely adding addition heating load to the diff( plus you're cooking your rear pads and rotors).
(most of this data is coming from my last track day. Pretty much perfect scenario keep that in mind. Low of 44, high of 60)
During my track days I wouldn't really overheat on my first run or two, but the later sessions would overheat pretty quickly. So I started paying attention to the starting temps. During my later runs I would check in the staging area and the temp was still at 180+, even after sitting in the paddock area for over an hour. With starting temps this high I would trigger the warning after about 15 min or so :( and had to call it quits. Even a slow lap to try to cool it off didnt really help at all (again, terrible airflow). So I decided to try and reduce starting temps.I found a ryobi fan at home depot for like 40 bucks and already have plenty of power packs so I picked it up to take to the track. Between my sessions I would place it under the car blowing directly on the diff.I think it would be most effective to put a fan on the front side of the diff where the driveshaft enters blowing back but the fan did not fit under there.
I drive about an hour or so to the track and my first run usually has time to cool down to under 100 degrees by my first session. No temp warning. Off the track at 250 degrees. Put the fan on it and see immediate huge reduction in temps. It went from 240 to 140 in about 15 min. HUGE! After having the fan blow on it for the entire time between sessions, around and hour and a half, I have temps at around 113. The fan is blowing on the back cover where the sensor is so as soon as I pull the fan off and drive to stage the temp is up to about 125. It holds there until start. Didn't get any temp warnings off of my 30 min session. I do this between each session with similar results. It never really has time to get below 120 by the time I drive onto the track. Kinda a bummer with ambient temps around 55, but much better than starting at 190. I didnt get a warning on sessions 1-4, and finally got the temp warning 27 min into my 5th and final session. By this time the ambient temps were around 60.
Im sure as the season goes on and temps get warmer this might not be as effective, but Im pretty stoked the combination of all this has pretty much gotten me to my goal of 25 min overheat free. Ill post back as the summer months come on to see how it goes, but Im likely to continue improving with my driver mod too, so the combo of higher ambient temps and pushing the car harder might make all this less effective and I'll still end up needing a cooler. We shall see. Hope this helps somebody.
Cheers
More info Here:
https://www.mustang6g.com/forums/threads/ftb-diff-cooler-installed.114217/
https://www.mustang6g.com/forums/threads/2018-gt-pp2-rear-differential-overheating-issue.106844/
Kinda Here
https://www.mustang6g.com/forums/th...-for-the-mustang-āsuper-8-8ā-rear-end.117720/
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